Valve mechanism for internal-combustion engines.



C. E. DRUMMOND L E. J. BOSTOCK. VALVE MEGHANISM EUR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED FEB.25.1910.

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'am 5535s C. E. DRUMMOND 61; F. J. BOSTOGK. VALVE MECHANISM FOR INTERNAL GOMBUSTION ENGINES.

APPLIUATION FILED max za, 1910.

983,220. 1 Patented Jan.31, 1911.

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(L E. DRUMMOND & E. J. BOSTOCK. VALVE MEGHANISM FOR INTERNAL GOMBUSTION ENGINES. APPLICATION FILED PEB. 25.1910. 983,220. Patented Jan; 31, 1911.

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vanua Mncnanrsar ron INTERNAL-commissionencinas Speccaton of Letters Patent. Application'led February 25, 1910.

Patented aan. an, reir,l semi no. 545,872,

To all whom 'it may cofre/cem:

Be it known ,that we, CHARLES EDWARD DnUMMoND and FRACIS JOHN BosTooK, subjects of the King of Great Britain, residing at ll Tennyson road, SmallHeath, near Bir` mingham, England,'and 22 Bristol road, Bournbrook, near Birmingham, England, respectively, have invented certain new and useful Improvements in Valve Mechanism for Internal-Combustion Engines, of which the following is a specilication.

This invention relates to valve mechanism for controlling the inlet and exhaust gases of internal combustion engines, principally of the four-stroke cycle, said mechanism being of the slide valve type in which a piston, separating the inlet from the exhaust, -is arranged to slide Within, or Work inconjunction with, a ported sleeve, which also has a sliding movement imparted to it.

The object of the 'present invention is to provide an improved and moreeilicient arrangement of such mechanism in which a iixed ported sleeve or liner is employed be tween the piston and the sliding sle e;

Figure 1 oi' the accompanying drawings is a sectional View of the improved valveA mechanism,

matically. This view shows the mechanism in the position in which the cylinder is placed in communication with the exhaustl passage.

a: F l. Fig. 3 represents a section .on line mi lfig. 1,-showing the arrangement of thel sleeve member and also Fig. LlshoWs diagramof the valve members nnn'lediately prior to placing the 'combus` tion chamber in communication with the exu haustpassage. Fig. 5 illustrates the mechaports .in the moving in the fixed liner.

'nism after the cylinder has been closed to the exhaust.

Fig. 6,- shows closed positionr of the valve just before the-inlet passage is placed in communicationfwith thecylinder.y Fig. `7 represents a valve after communi--v cation with the The same'referenee numeralsfindi'cate con le'spond'ingparts in; ieaehf ofthe 'figures lof thedmwings,

-' "Ats'thenpperend `,of the: engine-cylinder l,

a; transverse horizontalcylinder 2 'is provided, which communica-tes with the engine cylinder laby aA port3 through which both the in-going and exhaust the eccentrics for operating the',- v'alve members being represented diagram- Fig. 2 lis a cross-section on lineinletv passage has just been gases are arranged to pass to and from the cylinder.' The left. hand end of the cylinder I2 communicates with-the exhaust passage and the right hand end with lthe inlet pipe. Extending into by an annular space, isa concentric fixed sleeve or liner l2 having ports 13 opposite to the cylinder portfi .Arranged to slide Within the space vbetween the fixed sleeve l2 and inside walls of valve ciprocating sleeve l provided with ports or openings 5 adapted-to coperate withthe port 3 leading into the'enginefcylinder so as to 'place the latter communication with the inlet or exhaust passages,'or so as to close the cylinder to both inlet and exhaust. lVithin the interior of the fixed sleeve l2 is a sliding piston 6 adapted, by the means hereA after described, to be reciprocated backward( and forward and to cooperate with the ports .13 in said .Sleeve l2 Vso as to determine whetherztheJ-'inlet'or exhaust passages' shall be placed in' communication with the engine cylinder'. c Thefsliding sleeve 4 and piston 6 are'arrangedgto' be reciproeated by means of. connecting rods 7, 8, connected with cranks or--eccentrics 9, l0 (shown diagrammatieally) set at a certain pre-determined angle relatively to one another, and mounted upon a 'shaft 11 driven from the engine by any suitable means.

lows :-Assum1ng the parts tol be in the position shown in Fig'. 4,- then as the eccentric 11 rotates, the piston 6 and sleeve 2l both move toward the left, When'the ports 5 in said-sleeve immediately commence to overlap or uncover the cylinder port 3, placing the engine cylinder in communication with the exhaust passage, the exhaust gases leavingr the cylinder and passing through the ports 13 of fixed sleeve or liner l2, and thence away to the left of the piston 6. As the sleeve 4 continues its motion, the piston 6 moves ata faster rate owing tothe relative positions of the eccentrics or cranks,-and by the time the ports of the sleeve coincide with the cylinder port,l as shown in Fig. '5, the piston has completely closed the ports 13 in the sleeve 12, thus cutting oil' communiea ti-on between the exhaust passage and the cylinder. Further movement of the piston to the left- (see'Fig. 6)'caus'es the ports 13 to beuncovered ytythe right hand end of the said cylinder 2, butseparated. therefrom cylinder 2 is a ref The action of the mechanism is as fol-k a right and pelled topass, a stationary bushing the piston, the cylinder being thereby placed in communication with the 'inlet pipe during the suction stroke of the engine. The two members of the valve now-move in opposite directions, the sleeve t returning toward the the piston 'continuing its lmovement to the left, said sleeve at the end of the suction stroke, closing the Cylinder port as shown in Fig. 7. The said port con,- tinues to remain closed until the commercementof the exhaust stroke, the parts again coming to the positions shown in Fig. 4.

' Itis understood that the eccentrics which operate the piston and sleeve are so set with respect to one another that the parts are Vtimed to act as abovedescribed. The liner l2 serves lto protect. the sliding sleeve 4 from the heat of the exhaust gases.

H aving fully described our invent-ion,

what We desire to claim and secure by Letters Patent is:-

In a valve mechanism for internal combastionv engines, in combination, a valve chamber having an intermediate port. leading into the engine cylinder through which both the inlet and exhaust gases' are comy arranged within the valve chamber in spaced relation thereto7 the bushing communicating at its opposite ends respectively with the inlet and exhaust passages and having ports correspondingto andcommunicating with the intermediatev port, a sliding sleeve valve lnember which works in the Space between the lwalls of the chamber and the bushing and has ports to coperate with the said intermediate port and with the ports of the bushing, and a closed piston valve member which is positively and continuously reciprocated within-the said bushing from a movable partuof the engine, and constitutes a 'sliding partition to separate theinlet and exhaust ends of the valve: chamber, the

movement ofthe said piston member being so timed with relation to the movement of the sliding'sleeve and to the exhaust and suction strokes of the' engine piston as to alternately place the engine cylinder'in communication with the inlet and exhaust ends of the valve chamber so as to govern the admission and exhaust. of the engine, the end of said chamber which is opposite to that in communication with the cylinder being isolated.from the latter inner piston'member of the valve.

In testimony whereof We have hereunto set 'our han s in presence of t'worsubscribing witnesses.

CHARLES /EDWARD DRUMMOND. FRANCIS JOHN ROSTOCK.

Witnesses HENRY SKERRn'rr, HENRY NORTON SKERRETT.

by means of the 

